[ADEQ Forecasts] ADEQ Daily Air Quality Forecast For Thursday, February 05, 2009

Wed Feb 4 12:36:47 MST 2009

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Health message for Wednesday February 04: Unusually sensitive people should consider reducing prolonged or heavy exertion. 

Health message for Thursday February 05: Unusually sensitive people should consider reducing prolonged or heavy exertion.  

Synopsis and Discussion
Highest local coarse particle (PM-10) levels have steadily risen this week from the good range of the Air Quality Index on Sunday to the mid-moderate range of the AQI on Tuesday.  Valley rainfall was rather scarce during January, and the warm and dry weather of late has begun to take a toll on soil moisture levels.  In addition, moderate to strong inversions the past six mornings - along with bouts of less-than-favorable dispersion - have contributed to elevating pollution levels.  Fortunately, the strong ridge aloft that has been in control of Arizona's weather the past few days is moving east in response to the approach of  a vigorous but rapidly weakening upper level trough and surface cold front in the mid-latitude storm track. This first system will dampen out by the time it reaches the Valley and no rainfall is expected.  Showers are expected to be on the increase by Friday, however, in advance of a much stronger weather disturbance.  Gusty - but not particularly strong - gradient winds will occur over the local forecast area the next few afternoons; until significant rainfall occurs, fugitive dust emissions are possible from those parts of the metro area where large areas of disturbed soil exist.

If you have any questions or comments regarding this forecast please contact:
The Arizona Department of Environmental Quality
Office of Communications
1110 W Washington St, Phoenix, AZ 85007
(602) 771-4583 


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